Bulova 12EBACD (Buren 1322) is Swiss movement from 1960’s.
Functions: sweep second, date – changing between 23 and 24 h
Automatic movement with 17 or 30 jewels
f = 19800 A/h
Power reserve: 54 hours
Diameter: 28.15 mm
Angle of lift: 48°, micro rotor, double jewel bearing if 30 jewels double excenter
regulator for curb pins and stud carrier
selfwinding gear with direction switching by a pinion floating between two huge jewels
Oscillating weight set in the movement. No additional height taken up by the self-winding mechanism. Oscillating
weight made of heavy antimagnetic alloy. Mechanical inverser on roller bearings: no wear. Automatic engaging and disengaging of manual and automatic winding. Thus only the operating gear turns, performance is improved and there is no wear. Sliding pinion set between large jewels.